[英]Recharts Line chart doesn't plot new point on data update
I have a simple app that allows users to track their weight over time.我有一个简单的应用程序,允许用户随时间跟踪他们的体重。 When a user adds a new entry, the chart updates and is definitely receiving the new data in the props, but isn't plotting the new point.
当用户添加新条目时,图表会更新并且肯定会在道具中接收新数据,但不会绘制新点。
Recharts component:图表组件:
import React from 'react';
import {
ResponsiveContainer,
LineChart,
Line,
CartesianGrid,
XAxis,
YAxis
} from 'recharts';
import moment from 'moment';
const TrackingChart = (props) => {
const {
data
} = props
let date_min = 0
let date_max = 0
if (data.length > 0) {
date_min = data[0]['date'] - (1000 * 60 * 60 * 24)
date_max = data.slice(-1)[0]['date'] + (1000 * 60 * 60 * 24);
}
const dateFormatter = date => {
// return moment(date).unix();
return moment(date).format('DD-MMM-YY');
};
return (
<ResponsiveContainer width="100%" height={300}>
<LineChart data={data}>
<Line dataKey="weight" stroke="#8884d8" />
<CartesianGrid stroke="#ccc" />
<XAxis
dataKey="date"
scale="time"
type="number"
domain={[date_min, date_max]}
tickFormatter={dateFormatter} />
<YAxis />
</LineChart>
</ResponsiveContainer>
)
}
export default TrackingChart
I know the chart received the new data into props as the x-axis updates, example below:我知道图表将新数据接收到道具中作为 x 轴更新,示例如下:
Chart before adding new data添加新数据前的图表
Chart after adding new data添加新数据后的图表
data date - 31-May-2021 weight - 60数据日期 - 2021 年 5 月 31 日体重 - 60
The TrackingChart
component definitely has the updated props: TrackingChart
组件肯定有更新的道具:
And the LineChart has the updated data also:折线图也有更新的数据:
Any ideas why the chart itself doesn't add the new datapoint to the chart in the DOM?图表本身不向 DOM 中的图表添加新数据点的任何想法?
After a bit of trial and error - I seem to have come up with a solution, which is to pass a dynamic key to each component in the chart object.经过一番反复试验 - 我似乎想出了一个解决方案,即将动态密钥传递给图表 object 中的每个组件。 When a new data point is added, the key will automatically increment by 1, and so the whole object re-renders.
添加新数据点时,key 会自动加 1,因此整个 object 会重新渲染。
return (
<ResponsiveContainer
width="100%"
height={300}
data={data}
key={`rc_${data.length}`}>
<LineChart data={data} key={`lc_${data.length}`}>
<Line dataKey="weight" stroke="#8884d8" key={`l_${data.length}`}/>
<CartesianGrid stroke="#ccc" />
<XAxis
dataKey="date"
scale="time"
type="number"
domain={[date_min, date_max]}
tickFormatter={dateFormatter} />
<YAxis />
</LineChart>
</ResponsiveContainer>
)
Eventually, I probably only want to pass in eg the last 10 or 20 entries, so will probably need to make the key value a prop to pass down, but the priciple works最终,我可能只想传入例如最后 10 或 20 个条目,因此可能需要将键值作为传递的道具,但原则有效
This may not solve the problem above, but this may help others.这可能无法解决上述问题,但这可能会帮助其他人。
When passing in live data, use React state. Do not use a const list of objects and append to it.传入实时数据时,使用 React state。不要使用常量对象列表和 append。 This won't send an event that the chart needs to be updated.
这不会发送图表需要更新的事件。
const [data, setData] = React.useState([{ name: "", data: 0 }]);
setData((old) => [...old, { name: 'first', data: 1 }]);
Then pass data through your props.然后通过你的道具传递数据。
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